short circuit high quality scales that are actually the identity

src/core/SkBitmapProcState_matrixProcs.cpp

 /* NEON optimized code (C) COPYRIGHT 2009 Motorola
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcState.h"
 #include "SkPerspIter.h"
 #include "SkShader.h"
 #include "SkUtils.h"
@@ skipping 459 matching lines @@
             fill_backwards(xptr, width - 1, count);
         }
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkBitmapProcState::MatrixProc SkBitmapProcState::chooseMatrixProc(bool trivial_matrix) {
 //    test_int_tileprocs();
     // check for our special case when there is no scale/affine/perspective
-    if (trivial_matrix) {
-        SkASSERT(SkPaint::kNone_FilterLevel == fFilterLevel);
+    if (trivial_matrix && SkPaint::kNone_FilterLevel == fFilterLevel) {
         fIntTileProcY = choose_int_tile_proc(fTileModeY);
         switch (fTileModeX) {
             case SkShader::kClamp_TileMode:
                 return clampx_nofilter_trans;
             case SkShader::kRepeat_TileMode:
                 return repeatx_nofilter_trans;
             case SkShader::kMirror_TileMode:
                 return mirrorx_nofilter_trans;
         }
     }
@@ skipping 22 matching lines @@
     if (SkShader::kRepeat_TileMode == fTileModeX && SkShader::kRepeat_TileMode == fTileModeY) {
         return SK_ARM_NEON_WRAP(RepeatX_RepeatY_Procs)[index];
     }
 
     fTileProcX = choose_tile_proc(fTileModeX);
     fTileProcY = choose_tile_proc(fTileModeY);
     fTileLowBitsProcX = choose_tile_lowbits_proc(fTileModeX);
     fTileLowBitsProcY = choose_tile_lowbits_proc(fTileModeY);
     return GeneralXY_Procs[index];
 }